I have this bad boy...way over spec, weighs a ton but gets the job done. I get a work out moving it around and it provides amusement in the garage at track days as lesser jacks cower in its presence and run to the shadows. It's low profile too.
I bought it for the extra raise height it provides. I combined with 6t stands, again for the extra rise height. The 2-3 inches makes a difference for the full figured performance enthusiast when draining the clutch and removing the underside panels.
http://www.northerntool.com/shop/too...5429_200345429